CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common stock [Member]	Preferred stock [Member]	Nonvested restricted stock [Member]	Additional paid-in capital [Member]	Accumulated other comprehensive income (loss) [Member]	Retained earnings [Member]	Total
Balance at Dec. 31, 2019	$ 77		$ (803)	$ 106,152	$ (298)	$ 100,732	$ 205,860
Balance, shares at Dec. 31, 2019	7,672,678
Net income						7,510	7,510
Proceeds from exercise of stock options				962			962
Proceeds from exercise of stock options, shares	52,466
Issuance of restricted stock			(406)	406
Issuance of restricted stock, shares	9,500
Compensation expense related to restricted stock, net of tax			208				208
Compensation expense related to stock options, net of tax				511			511
Other comprehensive income (loss)					1,103		1,103
Balance at Jun. 30, 2020	$ 77		(1,001)	108,031	805	108,242	216,154
Balance, shares at Jun. 30, 2020	7,734,644
Balance at Mar. 31, 2020	$ 77		(1,105)	107,529	410	103,564	210,475
Balance, shares at Mar. 31, 2020	7,717,582
Net income						4,678	4,678
Proceeds from exercise of stock options				222			222
Proceeds from exercise of stock options, shares	17,062
Compensation expense related to restricted stock, net of tax			104				104
Compensation expense related to stock options, net of tax				280			280
Other comprehensive income (loss)					395		395
Balance at Jun. 30, 2020	$ 77		(1,001)	108,031	805	108,242	216,154
Balance, shares at Jun. 30, 2020	7,734,644
Balance at Dec. 31, 2020	$ 78		(698)	108,831	1,023	119,060	228,294
Balance, shares at Dec. 31, 2020	7,772,748
Net income						20,689	20,689
Proceeds from exercise of stock options	$ 1			2,520			2,521
Proceeds from exercise of stock options, shares	112,433
Issuance of restricted stock			(689)	689
Issuance of restricted stock, shares	14,750
Compensation expense related to restricted stock, net of tax			214				214
Compensation expense related to stock options, net of tax				564			564
Other comprehensive income (loss)					(623)		(623)
Balance at Jun. 30, 2021	$ 79		(1,173)	112,604	400	139,749	251,659
Balance, shares at Jun. 30, 2021	7,899,931
Balance at Mar. 31, 2021	$ 79		(1,075)	111,181	(90)	129,426	239,521
Balance, shares at Mar. 31, 2021	7,853,096
Net income						10,323	10,323
Proceeds from exercise of stock options				943			943
Proceeds from exercise of stock options, shares	42,835
Issuance of restricted stock			(212)	212
Issuance of restricted stock, shares	4,000
Compensation expense related to restricted stock, net of tax			114				114
Compensation expense related to stock options, net of tax				268			268
Other comprehensive income (loss)					490		490
Balance at Jun. 30, 2021	$ 79		$ (1,173)	$ 112,604	$ 400	$ 139,749	$ 251,659
Balance, shares at Jun. 30, 2021	7,899,931